Chassis, generic

C003A Right Rear Wheel Speed Sensor

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Covers the right rear wheel speed sensor and its circuit, completing the four-corner sensor set with C0031, C0034 and C0037. The active sensor reports rear wheel rotation to the ABS/ESC module for anti-lock, traction and stability control and electronic brake-force distribution. The module monitors the circuit for opens, shorts to power or ground, a signal outside the valid range and a missing signal while moving. Ford documents C003A with C0036 and C0037 on 2021 Bronco and Ranger vehicles built in a specific window, with an illuminated ABS warning. A fault disables ABS, traction and stability control and lights the ABS warning lamp while base braking remains available.

Likely causes

Wheel speed sensor bent or failed
Open, shorted or chafed sensor wiring
Corroded sensor connector

Symptoms

  • ABS warning lamp on
  • ABS and stability control disabled
  • Speedometer may read erratically

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–400
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

rr wss

Related codes

C0039C0037C0034

References: static.nhtsa.gov, en.wikipedia.org.